英文關鍵字
flies
blue
sky
red
flag
means
complete
ban
swimming
because
storm
whirlpool
beach
danger
caution
dangerous
hurricane
ocean
sea
coast
hazard
safety
shore
sign
water
wind
banner
color
forbidden
landscape
prohibition
protection
rescue
risk
summer
warn
wave
windy
attention
coastline
seaside
surf